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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1146ee69c6ef1d485d230191832c5967f323f6d96db05e6ca4fb72052eef7891' 
  AND token = 'H78f4i8fksaj5Uj41Rls1BQXiBtY1qlnEey3ZUYE0qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}